Evaluating the effect of using artificial pore water on the quality of laboratory hydraulic conductivity measurements of peat
Evaluating the effect of using artificial pore water on the quality of laboratory hydraulic conductivity measurements of peat
复制标题
评估使用人工孔隙水对泥炭实验室水力传导率测量质量的影响
DOI：
10.1002/hyp.7693
复制
发表时间：
2010
影响因子：
3.2
通讯作者：
Kettridge N
中科院分区：
文献类型：
--
作者：
Kettridge N
孔隙扩张，即絮凝过程中腐殖酸在泥炭纤维上的压实，导致泥炭的水力传导率随着孔隙水电导率的增加而增加。这是一个可逆过程，孔隙水电导率的降低会由于孔隙收缩而导致导水率降低。我们验证了由于使用人工孔隙水（主要是去离子水）而导致的孔隙扩张和收缩如何影响泥炭水力传导率的实验室测量。对泥炭藓样品进行水力传导率的重复测量。结果表明，在恒水头渗透仪测试中使用去离子水会导致导水率显着下降。在测试之间，由于滞后的孔隙收缩效应，泥炭的水力传导率持续下降，而孔隙水电导率没有相应下降。我们建议，在实验室水力电导率测量过程中，人为地提高或降低孔隙水电导率可能会导致重大误差。因此，必须修改实验方案以更好地考虑孔隙水化学。天然孔隙流体的离子浓度应在水力传导率测试期间通过使用从研究地点提取的孔隙流体或通过人工复制天然孔隙流体的主要离子组成来复制。此外，在进行水力传导率测量之前，应使用该溶液冲洗泥炭样品，直至水力传导率稳定并且随后使样品达到平衡。版权所有 © 2010 约翰威利父子有限公司
Pore dilation, the compaction of humic acids on peat fibres due to the process of flocculation, causes the hydraulic conductivity of peat to increase with increasing pore water electrical conductivity. This is a reversible process and a reduction in the pore water conductivity produces a decrease in the hydraulic conductivity due to the constriction of pores. We verify how this dilation and constriction of pores, resulting from the application of artificial pore water (primarily deionized water), affects laboratory measurements of the hydraulic conductivity of peat. Repeat measurements of the hydraulic conductivity were performed on samples ofSphagnumpeat. It is shown that the application of deionized water during constant head permeameter tests causes a significant decrease in the hydraulic conductivity. Between tests, the hydraulic conductivity of the peat continues to decline without an associate decrease in the pore water electrical conductivity because of a lagged pore constriction effect. We suggest that the use of artificially high or low pore water electrical conductivities, during laboratory hydraulic conductivity measurements, is likely to lead to significant errors. Experimental protocols must, therefore, be revised to take better account of the pore water chemistry. The ionic concentrations of the natural pore fluid should be replicated during hydraulic conductivity tests, either by using pore fluid extracted from the study site or by artificially replicating the major ionic composition of the natural pore fluid. In addition, prior to the hydraulic conductivity measurements, peat samples should be flushed with this solution until the hydraulic conductivity stabilizes and the samples subsequently allowed to equilibrate. Copyright © 2010 John Wiley & Sons, Ltd.
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